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Light and thermal responses of liquid-crystal-network films: A finite element study

Title
Light and thermal responses of liquid-crystal-network films: A finite element study
Author
최준명
Keywords
NEMATIC ELASTOMERS; POLYMER; DEFORMATION; SIMULATIONS; MOTION; ORDER
Issue Date
2015-04
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW E, v. 91, No. 4, Article no. 042503
Abstract
As a polymeric system incorporating rigid molecules within its structure, the liquid-crystal network (LCN) has been envisaged as a novel heterogeneous material. Under the influence of external stimuli, the orientational order of the liquid-crystalline phase becomes dilute and overall anisotropy is hence decreased; the actinic light absorbed by photochromic molecules, for example, induces the geometric isomerization and subsequently yields internal stress within the local network. In this study we investigate light-and temperature-induced spontaneous deformations of the LCN structure via a three-dimensional finite element model that incorporates geometric nonlinearity with a photomechanical constitutive model. We first examine the bending behavior and its nonlinearity and then parametrically study the various behaviors that stem from different origins ranging from the microscale to the macroscale: (i) the geometry of the LCN film, (ii) the macroscopic global order, (iii) the distorted mesogenic orientation due to the Fredericks distortion, and (iv) defect-induced instability. These interrelated behaviors demonstrate both the simulation capability and the necessity of the presenting framework. By employing a nonlinear consideration along with a microscopic shape parameter r the present approach facilitates further understanding of photomechanical physics such as the deconvolution of various stimuli and the deformed shape obtained due to snap-through instability. Furthermore, this study may offer insight into the design of light-sensitive actuation systems by deepening our knowledge and providing an efficient measure.
URI
https://journals.aps.org/pre/abstract/10.1103/PhysRevE.91.042503https://repository.hanyang.ac.kr/handle/20.500.11754/105992
ISSN
2470-0045; 2470-0053
DOI
10.1103/PhysRevE.91.042503
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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